Jig for grinding



Feb.

3,616,727 K. WILLIAMS J'IG FOR GRINDING Fild July 11. 1921' 2 Sheets-Sheet 1 K. WILLIAMS JIG FUR GRINDING Filed July 11, 1921 2 sh t s t Patented Feb. 8,1927.

" UNITED STATES 1,616,727 PATENT OFFICE.

KEITH WILLIAMS, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

' W. H. MINERQINQ, A CORPORATION OF DELAWARE.

are r012. am ne.

Application filed July 11,

This invention relates to'improvements in jig for grinding.

In certain types of friction draft gears for railway cars, commonly known in the art as Miner gears a wedge of special form is employed to create the necessary expansion or pressure against the friction shoes in developing the shock absorbing capacity. An example of such a wedge may be seen in OConnor Patents Nos. 1,220,264 granted March 27 1917, and 1,070,058 granted August 12, 1913. Such wedges employ three wedge faces spaced 120 apart and converging toward the inner end of the wedge. Each wedge face provides a seat for what is known as an anti-friction roller and at the inner end of each wedge face or roller seat there is an outwardly extended shoulder to limit the movement of the roller. On account of this formation. it has been found exceedingly difiicult to finish the wedge surfaces at the proper angle .with respect to each other, and withrespect to the axis of the wedge, both of which factors are of the utmost mportance in the operation of the type of gear referred to.

The primary object of my invention is to provide a jig by which such wedges are adapted to be clamped or chucked and prop-- end that the wedges may be finished accurately, quickly and without any special skill or judgment on the; part of the operator. As will be understood by those skilled in the art, the invention is usable for other purposes without departing-from the spirit of the invention.

In the drawings forming a. part ofthis s ecification, Fig. 1 is a part vertical section'- al view, part side elevational View of a jig embodying my invention. and showing the manner in which the wedge .is presented to the grinding wheel. Fig. 2 is a broken top plan view of the carriage and chuck holder showing the manner of adjusting the latter with respect to the carriage. Fig. 3

is a vertical sectional View taken centrally through the chuck in a plane parallel to the axis of the grinding wheel, as shown in Fig. 1. Fig. 4 is an elevational view looking squarely at the chuck proper. Fig. 5 is a detail view illustrating the locking pin ems ployed with the chuck. Fig. 6 is a detail sectional View corresponding substantially to the section line 66 of Fig, 3. And Fig.

bed plate is provided with a vertically exerly presented to a grinding wheel to the 1921. Serial No. 483,672.

manner of adapting the jig for wedges hav- 0 ing wedge faces of different inclination from those shown in the other figures.

Referring first to the'structure illustrated in Figs. 1 to 6 inclusive, 10 denotes a suitable heavy base or bed adapted to sustain the other parts of the jig. Said base or tended threaded opening 11 in which is vertically adjustable a heavy screw 12. The latter at its upper end, is swivelled to a support A extending generally in a horizontal direction. The support A is elevated and lowered by means of the screw 12 and in order to preventthe support A from turning with respect to the base 10, the latter may be provided with upstanding guides Y 13 engaging suitable depending portions of the support A. To effect the rotation of',

the screw 12, the latter has secured thereto at its upper end a bevel gear 14 with which meshes a bevel gear 15 seemed to theinner end of a horizontally disposed shaft .mounted in a suitable bearing 16 carried by the support A. Said shaft is manipulated by any suitable means such as a hand wheel 17 at its left hand end as viewed in Fig. 1.

The support A is provided on the upper face thereof with suitable guide grooves 18 with which cooperate correspondingly shaped guides 19 formed on the underside of a horizontally slidable carriage B. The carriage B is adjusted back and forth on the support A from left to right and viceversa as viewed in Fig. 1, by means of an adjusting screw 20 working in a nut 21 rigid with the carriage B, the right hand end of said screw being swivelled in an upstanding lug 22' of the support A. The left hand end of.the screw is suitably journaled in a bearing 23 formed in the carriage B, said screw being manipulated by a hand wheel 24 hav ing a hand grip 25.

Mounted on top of the carriage B is what may be termed a chuck-holder or plate G. The latter is formed on'its underside with a longitudinally extending guide 5 groove 26 cooperating with an upstanding triangular guide rib 27 formed on the carriage B. Other suitable bearing surfaces 28-28 are formed on the holder C and carriage B. Centrally thereof, the holder 0 l the shaft 32 carries a hand wheel 34 similar to the hand wheel 24 for effecting the necessar adjustments.

ith the arrangement so far described, it is evident that the chuck holder or plate U can be adjusted Vertically and also horizontally in either or both of two direct-ions at right angles to each other. Stated in another manner, the holder or plate C may be said to have universal adjustment an in this connection it will be noted that all three hand wheels 17 24 and 34 are located relatively close together so as to render the operation as convenient as possible for the operator.

Detachably but rigidly mounted on the top of the holder C by means of T bolts 35 and the usual T slots is what may be termed the chuck proper D. The latter, 'as shown, has a lower horizontally extending flange 36 and an integral heavy annular section 37 extending at an angle of with respect to the vertical. Said annular section 27 has a cylindrical opening therein provided with a preferably bronze liner 38. Rotatably mounted within said bronze liner 38 is a heavy plate 39 which is retained in place by a, suitable annular plate 40. The

heavy plate 39 carries three equally spaced. clamping jaws 41-41 of well knownform and adapted to be adjusted radially inwardly and outwardly by any one of the well known means. Said jaws are adapted to securely clamp the wedge E which, at its largerend,

is of cylindrical formation as indicated at 42. The annular section 37 of the chuck proper is recessed asindicated at 43 and extending therethrough is ahollow sleeve 44 having a flange 45 at its upper end secured to the plate 39 so that both are rotated in unison. Preferably a fiber disc 46 is interposed between the plate 39 and the bottom of the recess in which it is mounted.

The wedges E have three wedge faces or roller seats 47-47 the same being arranged at 120 to each other and, in the particular form shown in the drawings, said faces extend at an angle of 50 with respect to the axis of the wedge E, or, stated in another manner, at 50"v with respect to the vertical. With the arrangement so far described, the uppermost wedge face 47 will extend horizontally which will adapt it for proper grinding by the periphery of the emery wheel 48, the latter also preferably having a rounded edge 48 adapting it to fit in closely and properly against the roller stop 49 of to said plunger as indicated at 53 and also to a post 54 as indicated at 55 in Fig. 5. To rotate the plate 39 and the wedge carried thereby, I provide an annular band 56 swivelled between an integral flange 57 and an applied ring 58 on the hollow sleeve 44. Said band 56 has an opening 59 therein at one side through -which extends the bent end 60 of alever 67 pivoted as indicated at 68 to suitable ears formed on the band 56. By pulling the lever 67 in the direction indicated b the arrow a in Fi 6, it is evident that t e sleeve 44 will be cFamped the lever 67. y moving the lever 67 in the opposite direction, no turning of the sleeve 44 will take place. The operator, in rotatin the wedge to present the wedge faces thereof successively to the grinding wheel, first pulls the lever 52 and then.

swings the lever 67 in the direction indicated by the arrow a and allows the pin or plunger 51 to engage the next opening 50 as will be understood.

When a wedge E is iniposition as shown best in Figs. 1 and 3 with a face 47 against the grinder wheel, the wedge is worked transverse to the wheel or parallel to the axis by the manipulating of the hand wheel 24' and in a direction parallel to the plane of the wheel or at right angles to the axis of the grinding wheel by the manipulating of the hand wheel 34. The proper height is. of course. obtained by manipulating the wheel 17. The different faces are presented successively as hereinbefore described. From the preceding, it will be seen that the wedges may be ground or finished rapidly and the accurate and uniform grinding of the .wedge faces is insured by theparticular form of the jig without any skill on the part of the operator. 1

The wedge E shown in the drawings is one having the faces 47 thereof extending at 50 to the axis of the wedge as hereinbefore explained. It happens, however, that wedges of the type indicated have their faces 47 extended at different angles for different classes of friction gears and in order to adapt my jig for the grinding of wedges of different angled faces, .I employ wedge shaped shims F as indicated in Fig. 7 interposed between the chuck D and the chuck holder C. As will be evident to those skilled in the art, the angle of the wedge-shaped shims may be varied, that shown in the- .understood, however, that various changes and modifications may be made in the details of construction and the arrangement of parts.

and in the use, without departing from the spirit of the invention.

I claim:

1. In a. device of the character described, the combination with a grinder; of a horizontally disposed cai riage adjustable in a vertical plane and in a horizontal plane substantially at right angles to the vertical plane; of a chuck including a hollow annular section :having a horizontally disposed portion supported on said carriage, said annular'section having its axis disposed at an angle to said carriage, and having its top edges extending substantially parallel with thebottom portion thereof; and a plate rotatably mountedin said hollow section, said plate'being provided with means for gripping the work, said means being arranged-to hold the work in coaxial relation relative to said hollow section.

2. In a"device of the character described,

l the combination with ahorizontally disposed support; of a chuck having a portion mounted on said support and including a hollow annular section the axis of which is disposed at an angle to said sup rt;- a plate rotatably mounted in said holl w. section, said plate being provided with work holding means adapted to .hold the work co-axially with said annular section; and a spring actuated plunger carried by said annular section adapted to be selectively engaged with apertures arranged in a predetermined fashion in said plate.

3. In a'device of the character described,

the combination with a support; of a chuck mounted on said support, said chuck comprisin a hollow annular section and a plate rotatably mounted in said section; means for retaining said plate in said hollow section; an operating portion connected to said plate and extending through said annular section; a collar rotatably mounted on said KEITH WILLIAMS.

extension; and alever pivotally connected 

